21132154 has 4 divisors (see below), whose sum is σ = 31698234. Its totient is φ = 10566076.

The previous prime is 21132131. The next prime is 21132191. The reversal of 21132154 is 45123112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19158129 + 1974025 = 4377^2 + 1405^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283037 + ... + 5283040.

Almost surely, 2^21132154 is an apocalyptic number.

21132154 is a deficient number, since it is larger than the sum of its proper divisors (10566080).

21132154 is a wasteful number, since it uses less digits than its factorization.

21132154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10566079.

The product of its digits is 240, while the sum is 19.

The square root of 21132154 is about 4596.9722644367. The cubic root of 21132154 is about 276.4699425703.

Adding to 21132154 its reverse (45123112), we get a palindrome (66255266).

The spelling of 21132154 in words is "twenty-one million, one hundred thirty-two thousand, one hundred fifty-four".